Andy "Champ" Purcell (Wallace Beery) is the former world heavyweight champion, now down on his luck and living in squalid conditions with his eight-year-old son "Dink" in Tijuana, Mexico. Champ attempts to train and to convince promoters to set up a fight for him, but his efforts are consistently stymied by his alcoholism. Dink is repeatedly disappointed and let down by his father's irresponsible actions and frequent broken promises to quit drinking, but his utter devotion to his father nonetheless never wavers.